Japan’s DoCoMo, a carrier which was late to adopt the iPhone, lost more than 66,000 subscribers last month through a combination of having limited stocks of the iPhone 5s, and competitor carriers offering better deals. CNET alerted us to the number in a Nikkei report yesterday.

The iPhone has been reshaping Japan’s telecommunications market — one of the largest in the world — as it gains in popularity. DoCoMo’s problem is that it was late to the Apple phone game: the 5S and 5C are its first phone products from Apple.

Both Softbank and KDDI are offering incentives for upgrades to the 5s, and likely have better availability due to their long-established relationships with Apple. With DoCoMo also on board, the iPhone is expected to become the market leader in Japan.

As rumored leading up to today’s event, Apple announced today that it has struck a deal with NTT DOCOMO to bring its new iPhone lineup to Japan’s largest carrier when the device launches in multiple countries later this month. On September 20th the iPhone will launch on the carrier for the first time and Apple will also launch a single model of the iPhone 5c and iPhone 5s in Japan for KDDI and Softbank. Thanks to an increase to 13 LTE bands with the new iPhone 5s and 5c— which Apple says is more than any other smartphone– it will also be able to consolidate various models of iPhones for multiple carriers in other countries.

More LTE bands means that Apple will now be offering a single iPhone 5s and 5c model for AT&T and Verizon in the US (Sprint will still get its own model), while customers in the UK will be able to use a single iPhone model for EE, Vodafone, and Three’s upcoming LTE network. Apple will also have an TD-LTE compatible version of the new iPhones, but rumors of a deal with the world’s largest telecom, China Mobile, have not yet been confirmed.

Apple does plan to launch the new iPhones in China on September 20th alongside launches in the US, Australia, Canada, Germany, France, Singapore, UK, and Japan.

Bloomberg is reporting that shares of NTT DoCoMo are rising on rumors that Japan’s largest carrier will get the iPhone this year. The company’s rivals, KDDI and Softbank (who just bought Sprint) both currently carry the iPhone and saw their share price drop in morning trading.

[DoCoMo]Chief Financial Officer Kazuto Tsubouchi said there are compelling reasons for Apple and his company to reach an agreement, according to an interview published in SankeiBiz. For Apple, it doesn’t make business sense not to allow Japan’s largest wireless carrier to sell the iPhone, while DoCoMo wants to be able to sell most popular handsets, Sankei said.

A new iPhone from Apple is expected in September. The Japanese market are paying close attention to whether NTT docomo will be selling the new model or not. Having sold two other models as their main phones in the past summer season, the company is ready, as the vice-president Kazuto Tsubouchi has commented “the only problem is WHEN we are going to sell it.”…

Tsubouchi adds, “Nothing has changed. It will be difficult (to sell the iPhone on September 10th). But for Apple, it is not economically reasonable to not sell the iPhone on Japan’s largest carrier. As for NTT docomo, we must sell phone the customers desire. It’s a matter of terms.

Sprint (NYSE: S) today confirmed that it is currently engaged in discussions with Softbank regarding a potential substantial investment by Softbank in Sprint. Although there can be no assurances that these discussions will result in any transaction or on what terms any transaction may occur, such a transaction could involve a change of control of Sprint. Sprint does not intend to comment further unless and until an agreement is reached.

According to a report from Nikkei (via Bloomberg), Japan’s Softbank, the third-largest mobile carrier in the country, is currently seeking to acquire two-thirds of U.S.-based Sprint Nextel Corp. The price is rumored at roughly $19 billion USD and would make AT&T the last fully U.S.-based carrier:

Softbank Corp. (9984), Japan’s third- largest mobile-phone company, is in talks to buy control ofSprint Nextel Corp. (S), according to two people familiar with the matter…The deal would give Softbank a base for entering the U.S. market with a compatible carrier that uses similar equipment made by Sweden’s Ericsson AB, the Nikkei reported.

According to a Nikkei Business report (English), another iPhone carrier exclusive country has fallen. Softbank (in blue, above) in Japan has had a monopoly on the iPhone for the past three years in the world’s third largest economy. However, with the release of next iPhone, KDDI/au will carry the device. Both carriers still trail behind the leader NTT, as you can see in the un-translated image above.

According to the report, the iPhone will hit HDDI/au shops in November, a little later than the US expects to see them. If I’m not mistaken, KDDI operates a CDMA network, which is thought to be built into the upcoming worldphone iPhones.